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Component Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
    WARNING: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
    The High Voltage Disabling procedure will perform the following tasks:
    • Identify how to disable high voltage.
    • Identify how to test for the presence of high voltage.
    • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

    Failure to follow the procedures exactly as written may result in serious injury or death.
  1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  2. Ignition OFF, disconnect the drive motor generator battery vent fan relay.
  3. Test for 85-110 ohms across terminal 1 and terminal 2 on the vent fan relay.
    • If the resistance is not within the specified range, replace the drive motor generator battery vent fan relay.
  4. Test for infinite resistance between terminals 3 and 4 on the vent fan relay. If continuity is detected, replace the drive motor generator battery vent fan relay.
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